ClickHouse/docs/en/operations/system-tables/asynchronous_metrics.md

slug
/en/operations/system-tables/asynchronous_metrics

asynchronous_metrics

Contains metrics that are calculated periodically in the background. For example, the amount of RAM in use.

Columns:

• metric (String) — Metric name.
• value (Float64) — Metric value.

Example

SELECT * FROM system.asynchronous_metrics LIMIT 10

┌─metric──────────────────────────────────┬──────value─┐
│ jemalloc.background_thread.run_interval │          0 │
│ jemalloc.background_thread.num_runs     │          0 │
│ jemalloc.background_thread.num_threads  │          0 │
│ jemalloc.retained                       │  422551552 │
│ jemalloc.mapped                         │ 1682989056 │
│ jemalloc.resident                       │ 1656446976 │
│ jemalloc.metadata_thp                   │          0 │
│ jemalloc.metadata                       │   10226856 │
│ UncompressedCacheCells                  │          0 │
│ MarkCacheFiles                          │          0 │
└─────────────────────────────────────────┴────────────┘

See Also

• Monitoring — Base concepts of ClickHouse monitoring.
• system.metrics — Contains instantly calculated metrics.
• system.events — Contains a number of events that have occurred.
• system.metric_log — Contains a history of metrics values from tables system.metrics and system.events.